GW Instek AFG-3000 Series - Manual (Page 91)

MODULATION
91
Selecting Pulse Width Modulation
When selecting PWM, the current setting of the carrier frequency,
the amplitude modulation frequency, output, and offset voltage
must be considered.
Panel Operation 1. Press the MOD key.
2. Press F2 (Square).
3. Press the MOD key.
4. Press F4 (PWM).
PWM Carrier Shape
PWM uses a square wave as the carrier shape. Other wave shapes
cannot be used with PWM. If a carrier shape other than square is
used with PWM, an error message will appear.